May 1994

10

Philips Semiconductors

Preliminary specification

Stereo filter and codec

SAA2003

Table 2

Transparent mode function in sleep.

Notes

1. Transparent mode is controlled by bit 3 of the serial audio data interface mode control register.

2. WS-SEL is controlled by bit 3 of the codec extended settings register.

Serial audio interface

The signals between the SAA2003 and the serial audio input/output are shown in Table 3.

Table 3

Interface signals between SAA2003 and serial audio input/output.

The word select (WS) line indicates the channel being transmitted (either left or right; I or II) and is equal in frequency to

Operating at a frequency of 64

Of these bits a maximum of 36 are used to transfer data (samples may have a length up to 18 bits). Samples are

transferred most significant bit (MSB) first. Both WS and SD1/SD2 change state at the negative edge of SCK.

shown in Fig.8 or the EIAJ format as shown in Fig.9.

PIN

TRANSPARENT

PIN FUNCTION

FS256

1

X

FS256

FS256

0

X

high impedance

SD2

1

X

SD1

SD2

0

X

high impedance

IECOP

0

X

high impedance

IECOP

1

0

high impedance

IECOP

1

1

WS

PIN

INPUT/OUTPUT

FUNCTION

FREQUENCY

WS

bi-directional

audio data word select

SCK

bi-directional

audio data bit clock

SD1

bi-directional

serial audio data to/from DAIO and ADC

−

SD2

output

audio serial data to DAC

−

FDIR

output

PASC mode encode/decode

−

IECOP

output

alternative serial data word select for SD2

−